Insufficient memory available is qpss

Please read the forum guidelines - you've really not given enough to go on.

The simplest solution would be to post the entire spectre.out output file as an attachment (via the Options tab in the forum). You might need to rename it to "spectre.txt" to be able to upload it. That will give us useful information on the version, which options given to the simulator, the size of the circuit, and so on.

Regards,

Andrew.

 Dear Andrew,

 Thank you for your reply.

 please find attached log file for your reference.

Regards,

Darshak

Darshak,

Thanks for uploading the log file. A few key points:

• You are using a very old version of spectre. In late 2004, we decided to release spectre separately from the IC stream - it had previously been shipped as part of the IC stream (so was in IC5141). So we created the MMSIM stream and since then there have been MMSIM60, MMSIM61, MMSIM62, MMSIM70, MMSIM71, MMSIM72, MMSIM101, MMSIM111 and MMSIM121. That's 9 major releases of spectre since the version you're using. Please install a newer version (you can use this with IC5141 ADE though).
• Newer versions support running spectre in 64 bit mode (either add -64 as the userCmdLineOption in ADE's Setup->Environment, turn on the "64 bit" option on the Setup Environment form (if it is there in the version you're using) or "setenv CDS_AUTO_64BIT spectre" before launching icfb/virtuoso. This will allow you to access more memory.
• Newer versions will have a lot of new functionality and improvements
• In general Shooting QPSS can be quite memory intensive - you need to be particularly careful about the number of harmonics of the moderate signals - not making that too high.
• However, usually using harmonic balance (was introduced in MMSIM61, if my memory is right - so rather a long time ago now) will be more efficient for multi-tone simulation unless you have strongly non-linear behaviour. You can access this either via an option on the QPSS form (if using a new enough MMSIM and IC5141 subversion), or using the separate hb analysis. Even then with the size of circuit you have (not enormous, but reasonably large) you might need to run in 64 bit mode.
• Newer versions of MMSIM have a good set of example workshops in the installation - at <MMSIMinstDir>/tools/spectre/examples/SpectreRF_workshop/rfworkshop.tar.Z (PDF inside the compressed tar file, along with an example database) - which give you a good overview on how to use the tools.

Kind Regards,

Andrew.

 Hi Andrew,

 Thank you for your support.

 After changing to MMSIM72 and setting 64 bit simulation environment, QPSS and PSS are working fine.

 Regards,

Darshak